Question : _______countries participated in the Tokyo Paralympic 2020.

Option 1: 163

Option 2: 161

Option 3: 164

Option 4: 162

Question : The volume of a cone is 73920 cm³. If the height of the cone is 160 cm, find the diameter of its base.

Option 1: 21 cm

Option 2: 40 cm

Option 3: 22 cm

Option 4: 42 cm

Question : From a solid right circular cylinder of length 4 cm and diameter 6 cm, a conical cavity of the same height and base is hollowed out. The whole surface of the remaining solid (in square cm) is:

Option 1: 48$\pi$

Option 2: 15$\pi$

Option 3: 63$\pi$

Option 4: 24$\pi$

Question : In a class of 50 students, 22 girls scored an average of 35 marks in the test. What are the average marks of the boys if the class average is 42 marks?

Option 1: 50

Option 2: 52.5

Option 3: 47.5

Option 4: 55

Question : In an examination, the average marks obtained by the girls of a class is 85 and the average marks obtained by the boys of the same class is 87. If the girls and boys are in the ratio of 4 : 5, the average marks of the whole class (approximately) are closest to:

Option 1: 85.9

Option 2: 86.1

Option 3: 86.4

Option 4: 86.5